Flutter之自定义Dialog实现版本更新弹窗功能的实现

功能点：

1.更新弹窗UI

2.强更与非强更且别控制

3.屏蔽物理返回键（因为强更的时候点击返回键，弹窗会消失）

4.点击弹窗外透明区域时，弹窗不消失

先看下效果图：

Dialog实现代码：

import 'package:flutter/material.dart';
import 'package:xiaopijiang/utils/assets_util.dart';
import 'package:xiaopijiang/utils/toast_util.dart';

///created by WGH
///on 2020/7/23
///description:版本更新提示弹窗
class UpdateDialog extends Dialog {
 final String upDateContent;
 final bool isForce;

 UpdateDialog({this.upDateContent, this.isForce});

 @override
 Widget build(BuildContext context) {
 return Center(
  child: Column(
  mainAxisAlignment: MainAxisAlignment.center,
  children: <Widget>[
   Container(
   width: 319,
   height: 370,
   child: Stack(
    children: <Widget>[
    Image.asset(
     AssetsUtil.getImagePath(
      imageName: 'bg_update', suffix: 'png'),
     fit: BoxFit.cover,
    ),
    Container(
     width: double.infinity,
     child: Column(
     mainAxisAlignment: MainAxisAlignment.spaceBetween,
     children: <Widget>[
      Container(
      margin: EdgeInsets.only(top: 110),
      child: Text('发现新版本',
       style: TextStyle(
        fontSize: 20,
        color: Colors.white,
        decoration: TextDecoration.none)),
      ),
      Text(upDateContent,
       style: TextStyle(
        fontSize: 16,
        color: Colors.black54,
        decoration: TextDecoration.none)),
      Container(
      width: 250,
      height: 42,
      margin: EdgeInsets.only(bottom: 15),
      child: RaisedButton(
       color: Colors.red,
       shape: StadiumBorder(),
       child: Text(
        '立即更新',
        style:
         TextStyle(fontSize: 20, color: Colors.white),
       ),
       onPressed: () {
        ToastUtil.showTips('下载apk');
       }),
      )
     ],
     ),
    ),
    ],
   ),
   ),
   GestureDetector(
   onTap: () {
    Navigator.pop(context);
   },
   child: Offstage(
    offstage: isForce,
    child: Container(
     margin: EdgeInsets.only(top: 30),
     child: Image.asset(
     AssetsUtil.getImagePath(
      imageName: 'ic_update_close', suffix: 'png'),
     width: 35,
     height: 35,
     )),
   ),
   )
  ],
  ),
 );
 }

 static showUpdateDialog(
  BuildContext context, String mUpdateContent, bool mIsForce) {
 return showDialog(
  barrierDismissible: false,
  context: context,
  builder: (BuildContext context) {
   return WillPopScope(
    child: UpdateDialog(
     upDateContent: mUpdateContent, isForce: mIsForce),onWillPop: _onWillPop);
  });
 }

 static Future<bool> _onWillPop() async{
 return false;
 }
}

调用Dialog：

_checkUpdate() async{
 int serviceVersionCode = 101;
 PackageInfo packageInfo = await PackageInfo.fromPlatform();
 //获取当前的版本号
 int currentVersionCode = int.parse(packageInfo.version.replaceAll('.', ''));
 //如果获取服务器的版本号比当前应用程序的版本号还高，那么提示升级
 if (serviceVersionCode > currentVersionCode) {
  if(Platform.isAndroid){
  //Android平台在应用内进行更新
  //弹出"版本更新"的对话框
  UpdateDialog.showUpdateDialog(context, '1.修复已知bug\n2.优化用户体验', false);
  }else if(Platform.isIOS){
  //iOS平台跳转道AppStore进行更新
  }
 }
 }

重点说明：

屏蔽物理返回键（因为强更的时候点击返回键，弹窗会消失）

barrierDismissible: false,

4.点击弹窗外透明区域时，弹窗不消失

return WillPopScope(
    child: UpdateDialog(
     upDateContent: mUpdateContent, isForce: mIsForce),
    onWillPop: _onWillPop);

 static Future<bool> _onWillPop() async {
 return false;
 }

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